<template>
  <el-menu :default-active="activeMenu" mode="horizontal" @select="handleSelect">

    <template v-for="(item, index) in topMenus">
      <el-menu-item :style="{'--theme': theme}" :index="item.path" :key="index" v-if="index < visibleNumber">
        <svg-icon :icon-class="item.meta.icon" class="svg_style"/>
<!--        {{ item.meta.title }}-->
        <p> {{ item.meta.title }}</p>
      </el-menu-item>
    </template>

    <!-- 顶部菜单超出数量折叠 -->
    <el-submenu :style="{'--theme': theme}" index="more" v-if="topMenus.length > visibleNumber">
      <template slot="title">更多菜单</template>
      <template v-for="(item, index) in topMenus">
        <el-menu-item :index="item.path" :key="index" v-if="index >= visibleNumber">
          <svg-icon :icon-class="item.meta.icon" />
          {{ item.meta.title }}
        </el-menu-item>
      </template>
    </el-submenu>

  </el-menu>
</template>

<script>
import { constantRoutes } from "@/router/router";

// 隐藏侧边栏路由
const hideList = ['/index', '/user/profile'];

export default {
  data() {
    return {
      // 顶部栏初始数
      visibleNumber: 5,
      // 当前激活菜单的 index
      currentIndex: undefined
    };
  },
  computed: {
    theme() {
      return this.$store.state.settings.theme;
    },
    // 顶部显示菜单
    topMenus() {
      let topMenus = [];
      this.routers.map((menu) => {
        if (menu.hidden !== true) {
          // 兼容顶部栏一级菜单内部跳转
          if (menu.path === "/") {
              topMenus.push(menu.children[0]);
          } else {
              topMenus.push(menu);
          }
        }
      });
      return topMenus;
    },
    // 所有的路由信息
    routers() {
      return this.$store.state.permission.topbarRouters;
    },
    // 设置子路由
    childrenMenus() {
      var childrenMenus = [];
      this.routers.map((router) => {
        for (var item in router.children) {
          if (router.children[item].parentPath === undefined) {
            if(router.path === "/") {
              router.children[item].path = "/" + router.children[item].path;
            } else {
              if(!this.ishttp(router.children[item].path)) {
                router.children[item].path = router.path + "/" + router.children[item].path;
              }
            }
            router.children[item].parentPath = router.path;
          }
          childrenMenus.push(router.children[item]);
        }
      });
      return constantRoutes.concat(childrenMenus);
    },
    // 默认激活的菜单
    activeMenu() {
      const path = this.$route.path;
      let activePath = path;
      if (path !== undefined && path.lastIndexOf("/") > 0 && hideList.indexOf(path) === -1) {
        const tmpPath = path.substring(1, path.length);
        activePath = "/" + tmpPath.substring(0, tmpPath.indexOf("/"));
        this.$store.dispatch('app/toggleSideBarHide', false);
      } else if(!this.$route.children) {
        activePath = path;
        this.$store.dispatch('app/toggleSideBarHide', true);
      }
      this.activeRoutes(activePath);
      return activePath;
    },
  },
  beforeMount() {
    window.addEventListener('resize', this.setVisibleNumber)
  },
  beforeDestroy() {
    window.removeEventListener('resize', this.setVisibleNumber)
  },
  mounted() {
    this.setVisibleNumber();
  },
  methods: {
    // 根据宽度计算设置显示栏数
    setVisibleNumber() {
      //屏幕宽度 - 左侧logo+title(折叠时不再处理了) - 折叠按钮 - 右侧用户信息
      const width = document.body.getBoundingClientRect().width - 400 - 50 - 290;
      this.visibleNumber = parseInt(width / 100);
    },
    // 菜单选择事件
    handleSelect(key, keyPath) {
      this.currentIndex = key;
      const route = this.routers.find(item => item.path === key);
      if (this.ishttp(key) || route.isOpen) {
        // http(s):// 路径新窗口打开
        window.open(key, "_blank");
      } else if (!route || !route.children) {
        // 没有子路由路径内部打开
        this.$router.push({ path: key });
        this.$store.dispatch('app/toggleSideBarHide', true);
      } else {
        // 显示左侧联动菜单
        this.activeRoutes(key);
        this.$store.dispatch('app/toggleSideBarHide', false);

        let myRoutes = []
        if (this.childrenMenus && this.childrenMenus.length > 0) {
          this.childrenMenus.map((item) => {
            if (key == item.parentPath || (key == 'index' && '' == item.path)) {
              myRoutes.push(item)
            }
          })
        }
        setTimeout(() => {
          if (myRoutes[0].path != this.$route.path) {
            // 处理多级菜单
            let toPath = "";
            if(myRoutes[0].children && myRoutes[0].children.length > 0){
              toPath = myRoutes[0].path + "/" + myRoutes[0].children[0].path;
              if(myRoutes[0].children[0].query){
                let query = JSON.parse(myRoutes[0].children[0].query);
                let params = "?";
                for (const key in query) {
                  params+=key+"="+query[key]+"&";
                }
                toPath = toPath+params;
              }
            }else{
              toPath = myRoutes[0].path;
            }
            // 处理路由参数
            if(myRoutes[0].query){
              let query = JSON.parse(myRoutes[0].query);
              let params = "?";
              for (const key in query) {
                params+=key+"="+query[key]+"&";
              }
              this.$router.replace({
                path: toPath+params
              })
            }else{
              this.$router.replace({
                path: toPath
              })
            }
          } else {
            this.$router.replace({
              path: '/index'
            })
          }
        }, 100)
      }
    },
    // 当前激活的路由
    activeRoutes(key) {
      var routes = [];
      if (this.childrenMenus && this.childrenMenus.length > 0) {
        this.childrenMenus.map((item) => {
          if (key == item.parentPath || (key == "index" && "" == item.path)) {
            routes.push(item);
          }
        });
      }
      if(routes.length > 0) {
        this.$store.commit("SET_SIDEBAR_ROUTERS", routes);
      }
    },
    ishttp(url) {
      return url.indexOf('http://') !== -1 || url.indexOf('https://') !== -1
    }
  },
};
</script>

<style lang="scss" scoped>
.el-menu {
  background: #1890ff;
  color: #ffffff;
}

.topmenu-container.el-menu--horizontal {
  .el-menu-item {
    padding: 8px 15px 0 15px;
  }
}

.el-menu--horizontal > .el-menu-item {
  float: left;
  height: 100%;
  line-height: 0;
  border-bottom: 3px solid transparent;
  color: #ffffff;
  margin: 0 auto;
  text-align: center;
}

.el-menu--horizontal > .el-menu-item.is-active {
  background: #3059a7;
  color: #ffffff;
  border-bottom: 1px solid #ff4949;
}

.el-menu--horizontal > .el-menu-item:not(.is-disabled):hover, .el-menu--horizontal > .el-menu-item:not(.is-disabled):focus {
  background: #3665c1;
  color: #ffffff;
}

.el-menu-item:hover, .el-menu-item:focus {
  background: #3059a7;
  color: #ffffff;
}

.svg_style {
  width: 25px !important;
  height: 25px !important;
}
</style>
